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CN102656001B - Large container preform and a method of manufacturing large containers and large containers - Google Patents

Large container preform and a method of manufacturing large containers and large containers Download PDF

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Publication number
CN102656001B
CN102656001B CN 201080059124 CN201080059124A CN102656001B CN 102656001 B CN102656001 B CN 102656001B CN 201080059124 CN201080059124 CN 201080059124 CN 201080059124 A CN201080059124 A CN 201080059124A CN 102656001 B CN102656001 B CN 102656001B
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CN
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CN 201080059124
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Chinese (zh)
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CN102656001A (en )
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青木大一
塚本裕之
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日精Asb机械株式会社
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B65D1/023Neck construction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/18Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
    • B29C49/185Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps in different mould cavities
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6472Heating or cooling preforms, parisons or blown articles in several stages
    • B29C49/649Heating or cooling preforms, parisons or blown articles in several stages at least one stage being a heating stage used for shrinking of a preform prior to a subsequent blowing stage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B2911/00Indexing scheme related to making preforms for blow-moulding bottles or the like
    • B29B2911/14Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like
    • B29B2911/14586Mentioned dimensions
    • B29B2911/14593Wall thickness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B2911/00Indexing scheme related to making preforms for blow-moulding bottles or the like
    • B29B2911/14Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like
    • B29B2911/149Mentioned values not covered by B29B2911/14586
    • B29B2911/1498Weight
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06Injection blow-moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08Biaxial stretching during blow-moulding with or without prestretching
    • B29C49/10Biaxial stretching during blow-moulding with or without prestretching using mechanical means for prestretching
    • B29C49/12Stretching rods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS
    • B29K2067/00Use of polyesters or derivatives thereof as moulding material
    • B29K2067/003PET, i.e. poylethylene terephthalate
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2022/00Hollow articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/712Containers; Packaging elements or accessories, Packages
    • B29L2031/7126Containers; Packaging elements or accessories, Packages large, e.g. for bulk storage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/712Containers; Packaging elements or accessories, Packages
    • B29L2031/7158Bottles
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1397Single layer [continuous layer]

Abstract

一种大型容器用预塑形坯(20),用于利用延伸吹塑成形而形成的由聚对苯二甲酸乙二醇脂树脂构成的大型容器的制造,其特征在于,利用注射成形而形成而壁厚为6mm~9mm且纵轴长度比作为最终成形品的上述大型容器长。 A large, container preform (20), for utilizing stretch blow molding is formed by forming a large container manufactured polyethylene terephthalate resin, wherein, by injection molding and a longitudinal axis and a wall thickness of 6mm 9mm length - the length of the large container as a final molded article compared.

Description

大型容器用预塑形坯以及大型容器以及大型容器的制造方法 Large container preform and a method of manufacturing large containers and large containers

技术领域 FIELD

[0001] 本发明涉及用于由聚对苯二甲酸乙二醇脂(以下也称为PET)树脂构成且容量为10升以上的大型容器的大型容器用预塑形坯以及大型容器以及大型容器的制造方法。 [0001] The present invention relates to a preform made of polyethylene containers and large containers and large terephthalate resin (hereinafter, also referred to as PET) resin and having a capacity of 10 liters or more large vessels Large vessels the manufacturing methods.

背景技术 Background technique

[0002] 以往,作为例如矿泉水用可反复利用瓶等,世界上一般采用例如5加仑(约20升)的树脂制的大型容器。 [0002] Conventionally, as for example with mineral water bottles can be repeatedly used, generally use a large container such as 5 gallons (about 20 liters) of the resin in the world. 作为这样的大型容器的材料,一般使用聚碳酸酯树脂。 As the material of such a large vessel, the polycarbonate resin is generally used.

[0003] 矿泉水用可反复利用瓶等的大型容器通常在使用后从消费者处被回收,利用例如65°C左右的清洗液而被清洗(温水清洗)而多次地被再利用。 [0003] with large containers of mineral water bottles can be repeatedly used is generally recovered from consumers after use, using, for example about 65 ° C and cleaned by the cleaning fluid (warm water) to be reused several times. 因此,作为大型容器的材料,优选使用耐热性优异的聚碳酸酯树脂。 Therefore, as a material of a large container, it is preferable to use a polycarbonate resin having excellent heat resistance.

[0004] 但是,近年来确认从聚碳酸酯树脂制的容器会溶出环境激素。 [0004] However, in recent years, an acknowledgment from the container made of polycarbonate resin is eluted environmental hormones. 这在世界中被视作问题,即便是上述那样的大型容器的材料,也希望使用没有环境激素的溶出的危险的树脂材料。 This is regarded as the world's problems, even if the material above a large container, also did not want to use the dissolution of dangerous environmental hormone resin material. 例如,作为饮料用的小型容器等的材料而使用的PET树脂不存在环境激素的问题。 For example, PET resin is used as a material of small containers for beverages or the like using the absence of environmental hormones. 因此,研宄作为大型容器的材料也使用PET树脂的方案。 Thus, a Subsidiary also be used as a material of the PET resin scheme large packagings.

[0005] 但是,PET树脂制的容器一般而言耐热性低,所以在上述的温水清洗时存在容器变形(收缩)的问题。 [0005] However, PET resin containers generally low heat resistance, so that the problem vessel deformation (contraction) in the presence of the above-mentioned warm water washing. 因此,作为用于矿泉水用可反复利用瓶等的大型容器的材料,现状是无法采用PET树脂。 Therefore, as a material for large containers of mineral water bottles can be repeatedly used with the current situation is not using PET resin.

[0006] 为了解决这样的问题,例如本申请申请人提出了下述方案:利用吹塑成形而令预先注射成形了的预塑形坯沿两轴方向延伸而制造PET树脂制的大型容器时,对成形品以高于清洗液温度的温度进行退火(例如参照专利文献I)。 [0006] In order to solve such a problem, for example, the present applicant proposed the following scheme: and make advance the injection molding of the preform extending in the axial direction two by blow molding while producing a large container made of PET resin, of the molded article to a temperature above the annealing temperature of the washing liquid (e.g., refer to Patent Document I).

[0007] 利用这样的方法,能够提高PET树脂制的大型容器的耐热性而抑制温水清洗时的大型容器的变形,但是,仍然希望进一步提高大型容器的耐热性。 [0007] With such a method, a large deformation can be improved when the heat resistance of the container to inhibit a large warm water container made of PET resin, it is still desirable to further improve the heat resistance of the large container.

[0008] 例如,在饮料用的小型容器中,提出有下述方法:通过对预塑形坯进行一次吹塑成形而形成比最终成形品大的一次吹塑成形品,利用热处理令该一次吹塑成形品收缩,然后利用二次吹塑成形形成成为最终成形品的容器的制造方法(例如参照专利文献2)。 [0008] For example, in a small container of beverage, a method has been proposed: By a preform for blow molding to form the final molded article larger than the primary blow molded article by heat treatment enabling the primary blow shrink plastic molded product, and then secondary blow molding is formed using the manufacturing method of the final molded article container (e.g., refer to Patent Document 2).

[0009] 专利文献1:日本特开平11 一34152号公报。 [0009] Patent Document 1: Japanese Unexamined Patent Publication 11 34 152 the 1st.

[0010] 专利文献2:日本特开平3 - 205124号公报。 [0010] Patent Document 2: Japanese Unexamined Patent Publication 3 - Publication No. 205,124.

[0011] 但是,如果要利用该专利文献2所记载的方法制造大型容器,则对预塑形坯进行延伸吹塑成形时PET树脂发生白化,可知有可能丧失了PET树脂的作为最大的特征的透明性。 [0011] However, if using the method described in Patent Document 2 for producing a large container, of PET resin preforms for blow molding whitened when extended, as seen at risk of losing the biggest feature of the PET resin transparency.

[0012] 此外,在大型容器的预塑形坯的制造中,即便使用结晶化速度慢的共聚物作为材料,如果预塑形坯的厚度为约9_以上则会发生基于球结晶化的白化,所以厚度存在约9_以下这样的限制。 [0012] Further, in the production of the preform in large containers, even with slow crystallization rate of the copolymer as the material, if the thickness of the preform based ball whitening crystallization occurs above about 9_ , so there is less restriction to about 9_ thickness. 因此,能够作为材料进行利用的PET树脂的量受到限制,例如成为希望使用更多的材料而提高大型容器的刚性时等的限制。 Thus, the amount of PET resin can be utilized as the material is limited, for example, be a limitation upon the desired rigidity to improve the use of more material in a large container.

发明内容 SUMMARY

[0013] 本发明是鉴于这样的情况而提出的,目的在于提供一种大型容器用预塑形坯以及大型容器以及大型容器的制造方法,能够提高大型容器的耐热性并且能够良好地确保透明性。 [0013] The present invention was made in view of such circumstances and has an object to provide a large container preform and container, and a method for producing large large containers, large containers can be improved in heat resistance and capable of ensuring good transparency sex.

[0014] 为了解决上述课题,本发明为一种大型容器用预塑形坯,用于利用延伸吹塑成形而形成的由聚对苯二甲酸乙二醇脂树脂构成的大型容器的制造,其特征在于,利用注射成形而形成而壁厚为6mm〜9mm且纵轴长度比作为最终成形品的上述大型容器长。 [0014] In order to solve the above problems, the present invention provides a container with a large preform for stretch blow molding is formed using a large container manufactured from polyethylene terephthalate resin in which characterized in that the wall thickness is formed by injection molding and the vertical axis is 6mm~9mm longer than the length of the large container as a final molded article.

[0015] 通过使用所述本发明的大型容器用预塑形坯而制造大型容器,能够将纵轴方向的预塑形坯的延伸倍率抑制为较小,能够抑制此时产生的PET树脂的延伸结晶白化。 [0015] By using the preform manufactured using large packagings Large container according to the present invention, it is possible to preform the longitudinal axis of the stretching magnification can be kept small, extending the PET resin generated at this time can be suppressed crystal albino. 因而,能够制造耐热性优异且透明性也优异的大型容器。 Accordingly, a large container can be manufactured is excellent in heat resistance and is also excellent in transparency.

[0016] 在此,大型容器用预塑形坯的重量优选为550g〜800g。 [0016] Here, the weight of the large container preform is preferably 550g~800g. 由此,能够制造能够提高耐热性以及透明性并且能够确保足够的刚性的大型容器。 Thus, manufacturing is possible to improve the heat resistance and transparency and rigidity can be secured sufficiently large containers.

[0017] 此外,本发明是一种大型容器,使用上述大型容器用预塑形坯而制造,其特征在于,具有开口的颈部、筒状的主体部、密封该主体部的一端的底部、和连接上述颈部和上述主体部的肩部,上述肩部的壁厚比上述主体部的壁厚厚。 [0017] Further, the present invention is a large container, with a preform produced by using the large container, wherein an opening having a neck, a tubular body portion, a bottom seal one end of the body portion, and a shoulder portion connected to said neck portion and said body, a thickness of the shoulder portion is thicker than a thickness of the body portion.

[0018] 所述本发明的大型容器耐热性优异所以能够抑制由于温水清洗而导致的变形,并且具有良好的透明性,所以能够适宜地用作例如矿泉水用可反复利用瓶等。 [0018] Large heat-resistant container of the present invention is excellent in hot water can be suppressed due to the deformation caused by cleaning, and has good transparency, it can be suitably used, for example, can be repeatedly used with bottles of mineral water.

[0019] 进而,本发明为一种大型容器的制造方法,其特征在于,具有下述工序:将聚对苯二甲酸乙二醇脂树脂注射成形而形成纵轴长度比作为最终成形品的大型容器长的预塑形坯的注射工序;对上述预塑形坯进行吹塑成形而形成比上述大型容器尺寸大的一次吹塑成形品、对该一次吹塑成形品加热并且形成收缩至比上述大型容器小的尺寸的中间成形品的中间成形工序;将上述中间成形品在加热至既定温度的最终吹塑成形模具内吹塑成形而得到既定形状的上述大型容器的最终成形工序。 [0019] Further, the present invention is a method for producing a large container, comprising the steps of: polyethylene terephthalate resin for injection molding is formed as a longitudinal length than a final large molded article container preform injection step length; of the preform for blow molding a large container is formed larger than the size of the primary blow molded article, the primary blow-molded article is heated and shrunk to form than the large size intermediate the small container forming step of forming an intermediate article; the above-described intermediate molded product obtained above a large container of a predetermined shape in the final molding step is heated to a predetermined temperature of the final blow-molding a blow molding die.

[0020] 在所述本发明中,在中间成形工序中,通过加热一次吹塑成形品而促进PET树脂的结晶化,此外在令一次成形品收缩而形成中间成形品时将残余应力除去,所以能够提高作为最终成形品的大型容器的耐热性。 [0020] In the present invention, the intermediate molding step, the primary blow-molded article by heating to promote crystallization of the PET resin, also in order to form the primary intermediate molded article molding shrinkage residual stress is removed when the product, so the final container can be increased as a large heat resistance of the molded article. 此外,由于具有上述注射工序,能够将纵轴方向的预塑形坯的延伸倍率抑制为较小,能够抑制此时产生的PET树脂的延伸结晶白化。 Further, since the injection step, it is possible to preform the longitudinal axis of the stretching magnification can be kept small, the PET resin can be suppressed at this time extending generated whitening crystallization. 因而,能够制造耐热性优异且透明性也能够维持为良好的大型容器。 Accordingly, excellent heat resistance can be manufactured and transparency can be maintained as a favorable large containers.

[0021 ] 在此,上述中间成形品具有开口的颈部、筒状的主体部、密封该主体部的一端的底部、和连接上述颈部与上述主体部且比上述主体部壁厚的肩部,在上述中间成形工序中,在加热上述一次吹塑成形品时,优选将上述一次吹塑成形品的肩部以比上述主体部低的温度加热。 [0021] Here, the intermediate molded article having a bottom opening of the neck, a tubular body portion, the sealing portion of the one end of the body, and connected to said neck portion and the main body and a wall thickness than the body portion of the shoulder portion in the intermediate forming process, when the primary blow-molded article is heated, preferably to the primary blow-molded article at a shoulder portion lower than the heating temperature of the main body portion. 由此,能够抑制令中间成形品慢慢冷却时产生的壁厚较厚的肩部处的PET树脂的球结晶化所导致的白化。 Thus, the intermediate molding can be suppressed so that the ball whitened PET resin at the shoulder and the thick generated when cooled slowly crystallized product resulting. 因而,能够将大型容器的耐热性维持为良好并且进一步提高透明性。 Accordingly, it is possible to maintain a large heat-resistant container is further improved and good transparency.

[0022] 进而,在上述中间成形工序中,在加热上述一次吹塑成形品时,优选上述主体部的温度为140°C〜180°C,上述肩部的温度为80°C〜110°C。 [0022] Further, in the above intermediate molding step, at the time of heating the primary blow molded article, the temperature is preferably the body portion is 140 ° C~180 ° C, the temperature of the shoulder portion is 80 ° C~110 ° C . 由此,能够抑制令中间成形品慢慢冷却时产生的壁厚较厚的肩部处的PET树脂的球结晶化所导致的白化。 Thus, the intermediate molding can be suppressed so that the ball whitened PET resin at the shoulder and the thick generated when cooled slowly crystallized product resulting.

[0023] 此外,在上述中间成形工序中例如可以包含下述工序:在保持为常温的一次吹塑成形模具内将上述预塑形坯吹塑成形而形成上述一次吹塑成形品的一次吹塑成形工序;令上述一次吹塑成形品与加热为既定温度的热处理模具的内壁面接触而对一次吹塑成形品加热、并且将其内部的气体排出从而令其收缩而形成上述中间成形品的热处理工序。 [0023] Further, in the above example, the intermediate molding step may comprise the steps of: in a mold to the preform blow molding maintained at room temperature to form a primary blow-molding the primary blow-molded article of the primary blow molding step; order of the primary blow-molded article was heated in contact with the inner wall surface of the heat treatment mold to a predetermined temperature of the primary blow-molded article is heated and a gas is formed inside the intermediate molded article is discharged so as to make it heat shrinkage process.

[0024] 或者,在上述中间成形工序中例如在加热为既定温度的一次吹塑成形模具内将上述预塑形坯吹塑成形而形成上述一次吹塑成形品,并且该一次吹塑成形品通过与上述一次吹塑成形模具的内壁面接触而被加热,并且通过将其内部的气体排出而令其收缩而形成上述中间成形品。 [0024] Alternatively, the intermediate step in the blow-molding the preform in a mold heated to a predetermined temperature, for example, the primary blow molding to form the primary blow-molded piece, and the primary blow molded article by contacts the inner wall surface of the primary blow mold and is heated, and allowed to be contracted by the above-described intermediate molded article is formed inside the gas discharge.

[0025] 在这样的中间成形工序中,都能够通过加热一次吹塑成形品而促进PET树脂的结晶化,此外,能够在令一次成形品形成中间成形品时除去残余应力。 [0025] In the forming step, the primary blow-molded article can promote crystallization of the PET resin by heating in such intermediate, in addition, a molded article can be formed in order to remove the residual stress at the time the intermediate molded article. 因而,能够提高作为最终成形品的大型容器的耐热性。 Accordingly, the final container can be increased as a large heat resistance of the molded article.

[0026] 在以上的本发明中,能够提高由PET树脂构成的大型容器的耐热性,并且能够提高透明性。 [0026] In the above invention, it is possible to improve the heat resistance of large container made of a PET resin, and the transparency can be improved. 因而能够实现例如适宜地用作容量为5加仑(约20升)左右的大型的矿泉水用可反复利用瓶等的大型容器。 Thus, for example, it can be suitably used to achieve a capacity of 5 gallons (about 20 liters) with the left and right large mineral water bottle may be repeated using a large vessel.

附图说明 BRIEF DESCRIPTION

[0027] 图1是本发明的一实施方式的大型容器的局部剖视图。 [0027] FIG. 1 is a partial cross-sectional view of an embodiment of a large container embodiment of the present invention.

[0028] 图2是表示本发明的一实施方式的大型容器的制造方法的各工序中得到的成形品的概略说明图。 [0028] FIG. 2 is a schematic explanatory view showing respective steps of the molded product manufacturing method of a large container to an embodiment of the present invention is obtained.

[0029] 图3是说明本发明的一实施方式的注射工序的概略剖视图。 [0029] FIG. 3 is a schematic sectional view for explaining an embodiment of the injection process of the present invention.

[0030] 图4是说明本发明的一实施方式的一次吹塑成形工序的概略剖视图。 [0030] FIG. 4 is a schematic sectional view showing a step of primary blow embodiment of the present invention is formed.

[0031] 图5是说明本发明的一实施方式的热处理工序的概略剖视图。 [0031] FIG. 5 is a schematic sectional view showing a heat treatment step described embodiment of the present invention.

[0032] 图6是说明本发明的一实施方式的最终成形工序的概略剖视图。 [0032] FIG. 6 is a schematic sectional view for explaining an embodiment of the present invention the final molding step.

[0033] 附图标记说明 [0033] REFERENCE NUMERALS

[0034] 10…大型容器、11…口部、12…颈部、13…主体部、14…肩部、15…底部、16…跟部(匕一少部)、17…倾斜部、18…加强部、19…上底部、20…预塑形坯、21…颈部、22…主体部、 [0034] 10 ... Large containers, 11 ... opening portion, the neck portion 12 ..., 13 ... body portion, shoulder portion 14 ..., 15 ... bottom, 16 ... heel portion (dagger a small portion), 17 ... inclined portion 18 ... reinforcing portion, 19 ... bottom, 20 ... preform, the neck portion 21 ..., 22 ... main body portion,

30----次吹塑成形品、31…颈部、32...主体部、33...肩部、34...底部、40...中间成形品、41...颈部、42...主体部、44...肩部、45...底部。 30 ---- secondary blow molding, the neck 31 ..., 32 ... main body portion, shoulder portion 33 ..., 34 ... bottom, 40 ... intermediate molded article, the neck portion 41 ... , 42 ... main body portion, shoulder portion 44 ..., 45 ... bottom.

具体实施方式 detailed description

[0035] 以下,参照附图说明本发明的一实施方式。 [0035] The following describes one embodiment of the present invention with reference to embodiments. 图1是表示本发明的一实施方式的大型容器的局部剖视图。 FIG. 1 is a partial sectional view of a large container according to one embodiment of the present invention.

[0036] 图1所示的大型容器10以聚对苯二甲酸乙二醇脂树脂形成,例如用作容量为5加仑(约20升)左右的矿泉水用可反复利用瓶。 Large container shown in [0036] FIG. 110 polyethylene terephthalate resin is formed, for example, as a capacity of 5 gallons (about 20 liters) with the left and right can be repeated using a mineral water bottle. 该大型容器10在上端具有口部11,具有例如外径为Φ55_左右的颈部12、例如最大径为270_左右的筒状的主体部13、连接颈部12与主体部13而从颈部12侧慢慢地扩开的肩部14、密封主体部13的一端的底部15、连接主体部13与底部15的跟部16。 The container 10 has a large opening portion 11, for example, having an outer diameter of about Φ55_ neck portion 12, for example a maximum diameter of the cylindrical body portion 13 of about 270_ upper end connected to the neck portion 12 and the body portion 13 from the neck the side portion 12 gradually widened shoulder portion 14, the bottom end of the sealing portion 13 of the body 15, connected to the main body portion 13 and heel portion 16 of the base 15.

[0037] 在主体部13上形成有多个由环状的倾斜部17构成的加强部18。 A plurality of annular reinforcing portions 17 formed of the inclined portion 18 [0037] 13 formed on the body portion. 此外在底部15上形成有向容器内方突出的上底部19。 In addition there is formed projecting into the container 19 on the bottom 15 on the bottom. 利用这些加强部18以及上底部19而提高大型容器10的刚性(压曲强度),在向大型容器10内装入矿泉水等的内容物时,能够防止主体部13或者底部15变形。 With these reinforcing portions 18 and 19 on the bottom to increase the rigidity (buckling strength) of the large container 10, when charged with mineral water to the contents of large containers 10, 13 can be prevented or bottom of the main body portion 15 is deformed.

[0038] 进而,在本实施方式中,大型容器10的肩部14形成得比主体部13的壁厚厚,从而能够提高大型容器10的刚性。 [0038] Further, in the present embodiment, the shoulder portion 10 of the large container 14 is formed larger than the wall thickness of the thick portion 13 of the main body, it is possible to improve the rigidity of the container 10 is large. 另外这样地令肩部14的壁厚增厚则在制造过程中容易引起PET树脂的白化,但在本发明中,如后所述,能够良好地确保肩部14的透明性。 Further in this manner so that the wall thickness of the shoulder portion 14 is thickened easily whitened PET resin in the manufacturing process, but in the present invention, as described later, it is possible to ensure good transparency of the shoulder 14.

[0039] 以下,说明这样的本发明的大型容器10的制造方法。 [0039] Hereinafter, a method of manufacturing such a large container 10 in the present invention.

[0040] 如图2所示,大型容器10经由大型容器用预塑形坯(以下,简单地称为预塑形坯)20、一次吹塑成形品30以及中间成形品40而被成形。 [0040] 2, the large containers 10 via the large container preform (hereinafter simply referred to as preform) 20, the primary blow-molded article 30 and the intermediate molded article 40 is molded.

[0041] 首先如图3所示,使用注射成形模具100而利用注射成形而形成预塑形坯20 (注射工序)。 [0041] First, as shown in Figure 3 is formed using an injection molding die 100 by injection molding the preform 20 (injection step). 预塑形坯20是具有颈部21和有底筒状的主体部22的筒状体,其壁厚为6_〜9mm左右,纵轴长度LI形成得比作为最终成形品的大型容器10的纵轴长度L2长(参照图 20 is a preform having a neck portion 21 and a bottomed cylindrical body portion of the cylindrical body 22, a wall thickness of about 6_~9mm, the longitudinal axis than the longitudinal length LI is formed as the final molded article is the large containers 10 axial length L2 (see FIG.

2)。 2). 另外,大型容器10的纵轴长度L2是大型容器10的中心部的长度,如图2所示,是从大型容器10的口部11到上底部19的长度。 Further, the large length L2 of the longitudinal axis of the container 10 is the length of the central portion of a large container 10, shown in Figure 2, is the length of the base portion 19 from the large opening 11 to the container 10.

[0042] 通过这样地将预塑形坯20的纵轴长度LI形成为比大型容器10的纵轴长度L2长,详细如后所述,能够提高通过延伸吹塑成形该预塑形坯20而制造的大型容器10的耐热性,并且能够良好地确保透明性。 [0042] than the longitudinal length L2 of the large containers 10, as described later in detail, the molding can be improved by extending the preform 20 by a blow to the longitudinal axis so that the length of the preform 20 is formed and LI large container 10 made of heat resistance and transparency can be secured well.

[0043] 此外,通过将预塑形坯20的纵轴长度LI形成为比大型容器10的纵轴长度L2长,还具有能够良好地确保大型容器10的透明性并且提高刚性的效果。 [0043] Further, the longitudinal length of the preform 20 is formed LI than the longitudinal length L2 of the large container 10 further includes a transparency can be satisfactorily ensuring a large container 10 and increase the rigidity effect. 通过令预塑形坯20的壁厚增厚,即通过增加预塑形坯20的重量(PET树脂的使用量),能够提高大型容器10的刚性。 By having the thickened wall thickness of the preform 20, i.e., blank weight (the amount of PET resin) by increasing the preforms 20, it is possible to increase the rigidity of the container 10 is large. 但是如果预塑形坯20的壁厚过厚,则在预塑形坯20的制造过程中存在产生伴随着球结晶化的白化的问题。 However, if the wall thickness of the blank preforms 20 is too thick, then the preform 20 in the manufacturing process to produce the problems associated with the presence of the ball whitening crystallization. 但是,在本发明中,通过令预塑形坯20的纵轴长度LI比大型容器10的纵轴长度L2长,能够将预塑形坯20的壁厚抑制为与以往相同程度(6mm〜9mm左右)而令预塑形坯20的重量增加。 However, in the present invention, by having the longitudinal length of preform 20 LI than the longitudinal length L2 of the large container 10, the wall thickness of the preform can be suppressed to 20 is equal to that of the conventional (6mm~9mm left and right) so that the weight of the preform 20 increases.

[0044] 例如,以往的容量为5加仑左右的大型容器用的预塑形坯的重量如果考虑壁厚则最大也只能增加到650g左右。 By weight of the preform [0044] For example, a conventional volume of about five gallons of the large container of the maximum wall thickness if considering only increased to about 650g. 相对于此,本发明的预塑形坯20考虑到壁厚而能够将重量增加至700g以上,最大能够增加至800g左右。 In contrast, a preform 20 of the present invention take into account the wall thickness can be increased to a weight of 700g or more, can be increased to a maximum of about 800g. 因而,通过使用该预塑形坯20而制造大型容器10,能够避免伴随着PET树脂的结晶化的白化的产生,能够制造确保良好的透明性并且提高了刚性(压曲强度)的大型容器10。 Thus, by using the preform 20 is produced large containers 10 can be avoided crystallization accompanied by the production of whitened PET resin can be produced to ensure good transparency and the rigidity (buckling strength) of the large container 10 .

[0045] 此外,优选预塑形坯20的重量为550g〜800g左右。 [0045] In addition, preferably the preform is about 20 wt 550g~800g. 如果预塑形坯20的重量过轻,则作为最终成形品的大型容器10的刚性(压曲强度)有可能无法良好地确保所以不优选。 If the weight of the preform 20 too light, the container as a final molded product of large rigidity (buckling strength) may not ensure good 10 is not preferable. 另一方面,若预塑形坯20的重量过重即壁厚过厚,则如上所述,容易在吹塑成形时引起伴随着PET树脂的延伸结晶化的白化、及伴随着球结晶化的白化,不优选。 On the other hand, if the weight of the preform 20, i.e., the heavy wall thickness is too thick, as described above, along with extending prone PET resin crystallized whitened during the blow molding, and the ball along with the crystallized whitening is not preferable.

[0046] 此外,以往的大型容器用预塑形坯的重量为大约550g〜650g左右则只能够在比较狭窄的范围内变化,但本发明的预塑形坯20的重量能够在550g〜800g的相当宽的范围内变化。 [0046] Further, the conventional large container preform weighs approximately only about 550g~650g can vary within a relatively narrow range, but the present invention is a blank preforms 20 can be in the weight of 550g~800g changes within a substantially wide range. 因此,能够制造从例如刚性比较低但重量非常轻的容器到重量重但刚性非常高的容器、对应于用户的使用方式的多种多样的大型容器。 Thus, for example, it can be manufactured from a comparatively low rigidity, but very lightweight, yet rigid container to the heavy weight of the container is very high, corresponding to the user's use of a variety of large containers. 此外,在重量轻时,也能够利用比大型容器10长的预塑形坯。 Further, when the light weight, it is possible to use a large container 10 is longer than the preform. 此时,预塑形坯20变得薄壁,球结晶化导致的白化的可能性变得更小所以成形稳定,此外,能够缩短注射成形时的冷却时间所以能够提高制造循环。 At this time, thin-walled preform 20 becomes, the possibility of whitening due to crystallization of the ball becomes smaller so that the stability of forming, in addition, possible to shorten the cooling time during injection molding it is possible to improve the manufacturing cycle.

[0047] 另外,预塑形坯20的纵轴长度LI在比大型容器10的纵轴长度L2长比且一次吹塑成形品30的纵轴长度L3(图2参照)短的范围内设定即可,但期望在该范围内尽可能地长。 [0047] Further, the length of the longitudinal axis of preform 20 LI is longer than the longitudinal length L2 larger than the container 10 and the set primary blow product 30 within the short range of longitudinal length L3 (see FIG. 2) formed It can be, but is desirable as long as possible in this range. 例如,在将一次吹塑成形品30的纵轴长度L3形成为比大型容器10的纵轴长度L2大10%左右时,预塑形坯20的纵轴长度LI也优选形成为比大型容器10的纵轴长度L2长10%左右。 Is also preferably formed, for example, the longitudinal length of the primary blow molded article 30 is formed a longitudinal axis L3 of a length L2 of about 10% larger than the container 10, the preform longitudinal length LI 20 is larger than the container 10 the longitudinal length L2 of about 10%.

[0048] 成形这样的预塑形坯20的注射成形模具100具有:限定颈部21的外壁面的由水平方向上能够开闭的可分模构成的颈模101、限定主体部22的外壁面的注射腔模102、限定预塑形坯20的内壁面的芯模103。 [0048] Such molded preform 20 of an injection mold 100 comprises: a neck portion defining an outer wall surface 21 of the horizontal direction by the neck mold can be opened and closed configuration of the split mold 101, defining an outer wall surface of the main body portion 22 an injection cavity mold 102, defining the inner wall surface of the preform 20 of the core mold 103. PET树脂被从注射腔模102的中心部下侧的浇道104填充,预塑形坯20被注射成形。 PET resin is filled from the lower side of the center 104 of the runner injection cavity mold 102, the preform 20 is injection molded.

[0049] 该预塑形坯20被运送至未图示的加热部,被加热至既定的延伸适宜温度后,如图4所示,被配置于一次吹塑成形模具110内。 After [0049] The preform is conveyed to the heating unit 20, not shown, is suitably heated to a predetermined temperature extends, as shown in FIG. 4, is arranged in the primary blow molding die 110. 在该一次吹塑成形模具110内对预塑形坯20吹塑成形从而形成比作为最终成形品的大型容器10尺寸大的一次吹塑成形品30 (—次吹塑成形工序)。 In the primary blow molding die 110 pairs of blow molding a preform 20 so as to form a large container than a final molded article of a large size 10 primary blow molded article 30 (- secondary blow molding step).

[0050] 一次吹塑成形模具110具有能够开闭的一次吹塑成形可分模111、将预塑形坯20的颈部21插入在内部的吹塑芯模112、能够通过吹塑芯模112而上下移动的延伸杆113、和一次吹塑底模114。 [0050] The primary blow mold 110 having openable split mold 111 primary blow molding, the preform 21 is inserted into the neck portion 20 of the blow core mold interior 112, through the blow core mold 112 extends vertically movable rods 113, 114 and the primary blow mold bottom. 而且一次吹塑成形模具110具有沿着一次吹塑成形品30的外形形状的内壁面115。 And primary blow mold 110 having an inner wall surface 115 along the outer shape of the primary blow molded article 30.

[0051] 在一次吹塑成形工序中,预塑形坯20利用延伸杆113而被沿纵轴方向延伸,并且利用高压气体而被沿横轴方向延伸而被推压于一次吹塑成形模具110的内壁面115,从而成形一次吹塑成形品30。 [0051] In the primary blow molding step, the preform 20 using the extension rod 113 is extended along the longitudinal direction, and high-pressure gas is extending in the horizontal axis direction is pressed against the primary blow mold 110 the inner wall surface 115, thereby forming primary blow molded article 30. 此时,一次吹塑成形模具110没有被加热而维持为常温,所以从一次吹塑成形模具110取出的一次吹塑成形品30为沿着一次吹塑成形模具110的内壁面115的形状。 In this case, no primary blow mold 110 is heated and maintained at room temperature, so that the primary blow mold 110 is removed primary blow molded article 30 in the shape of mold 110 along an inner wall surface 115 of the primary blow molding.

[0052] 另外,在此通过一次吹塑成形工序而吹塑成形预塑形坯20从而形成一次吹塑成形品30,但也可以在一次吹塑成形工序之前实施令预塑形坯20沿其径向稍微延伸的所谓予吹塑工序。 [0052] Further, in this step by the primary blow-molding and blow-molding the preform 20 to form a primary blow-molded article 30, but may be implemented to make the preform before the step of primary blow-molding 20 in which extend slightly radially to a so-called blowing process. 由此,能够将一次吹塑成形工序中的预塑形坯20的延伸倍率抑制为较低,能够更加良好地形成一次吹塑成形品30。 Stretching magnification Thereby, the preform primary blow molding step 20 is suppressed to be low, it can be more satisfactorily primary blow-molded article 30 is formed.

[0053] 这样地成形的一次吹塑成形品30具有在注射工序中成形的颈部31 (21)、筒状的主体部32、连接主体部32和颈部31的肩部33、和堵住主体部32的一端的底部34,具有比作为最终成形品的大型容器10大的尺寸。 [0053] Such shaped primary blow molded article 30 having a shaped neck portion 31 in the injection step (21), a tubular body portion 32, shoulder portion connecting the body portion 31 of the neck portion 33 and 32, and blocked the bottom end 32 of the main body portion 34 having a large ratio of the final molded article container 10 large size. 此外,含有颈部31的纵轴长度L3比大型容器10的纵轴长度L2长(参照图2)。 In addition, the neck portion 31 containing a longitudinal length L3 than the longitudinal length L2 of the large container 10 (see FIG. 2).

[0054] 进而,在一次吹塑成形时,优选适宜地调节预塑形坯20的延伸温度,使得一次吹塑成形品30的肩部33的壁厚比主体部32的壁厚厚。 [0054] Further, when the primary blow molding, preferably suitably adjusting the temperature of the preform 20 extends such that the primary blow molded article 30 of the wall thickness of the shoulder portion 33 is thicker than the thickness of the main body portion 32. 由此肩部33的延伸倍率被抑制为较小,能够更可靠地抑制肩部33的伴随着PET树脂的延伸结晶化的白化。 Shoulder 33 thereby stretching ratio is suppressed to be small, can be more reliably suppressed extending shoulder associated with crystallization of the PET resin 33 whitening. 此外,通过将肩部33的壁厚确保为比较厚,能够提高作为最终成形品的大型容器10的刚性。 Further, by the thickness of the shoulder 33 is relatively thick to ensure that, as a large container can be improved rigidity final molded product 10.

[0055] 接着,如图5所示,在将被冷却为常温后的一次吹塑成形品30配置于热处理吹塑成形模具120内而进行了热处理后,形成令该一次吹塑成形品30收缩至比大型容器10小的尺寸而成的中间成形品40 (热处理工序)。 [0055] Next, as shown in FIG. 5, the heat treatment after the blow molding die 120 and the heat treatment for the primary blow-molded article 30 is to be cooled to the room temperature, enabling the formation of the primary blow-molded article 30 shrinkage 40 to the molded product (heat treatment step) is smaller than the intermediate 10 formed by the large container sizes. 另外,在一次吹塑成形品30被冷却至常温后,也可以马上对一次吹塑成形品30进行热处理工序,但实际上,反复进行上述的注射工序和一次吹塑成形工序从而一次制作多个一次吹塑成形品30,之后对这些多个的一次吹塑成形品30进行热处理工序。 Further, the primary blow-molded article 30 is cooled to room temperature, may be immediately primary blow-molded article 30 for the heat treatment step, but in fact, repeating the above step and the injection step of primary blow-molding whereby a production of multiple primary blow molded article 30, followed by heat treatment step of the plurality of primary blow molded article 30.

[0056] 热处理吹塑成形模具120具有:由收纳一次吹塑成形品30的可分模构成的热处理模具121、将一次吹塑成形品30的颈部31插入在内部的热处理用芯模122、与一次吹塑成形品30的底部34对应的上底加热模123。 [0056] The heat-treating blow mold 120 has: a split mold product heat treatment mold 121 composed of the housing 30 primary blow molding, the primary blow molded article 30 of the neck 31 is inserted in the interior of the heat-treatment core mold 122, and heating the primary blow-molding mold 12334 on the bottom corresponding to the bottom 30 of the product. 该热处理模具121的成形空间形成为与一次吹塑成形品30的外形大致相同的形状。 The heat treatment mold forming space 121 is formed to the shape of product 30 and primary blow molding substantially the same shape. 此外在热处理模具121中,在对应于一次吹塑成形品30的主体部32的部分中设置有多个例如12根的棒状的加热器124。 Further, in the heat treatment mold 121, the portion corresponding to the primary blow molded article 30 of the main body portion 32 is provided with a plurality of, for example, a rod-shaped heater 12 124. 这些加热器124以大致均等的间隔内置于热处理模具121的成形空间的周围,利用这些加热器124将一次吹塑成形品30的主体部32加热至既定温度。 The heater 124 built at substantially equal intervals around the forming space of the heat treatment mold 121, the heater 124 using the primary blow-molded article 30. The body portion 32 is heated to a predetermined temperature.

[0057] 此外,在热处理模具121中,在与一次吹塑成形品30的肩部33对应部分形成有例如供给被加热了的油等的温度调节介质的供给路125。 [0057] Further, in the heat treatment mold 121 in the primary blow molded article 30 of the shoulder portion 33 is formed with a corresponding portion of the supply passage 125 is supplied, for example, the heated oil temperature adjusting medium. 由此,能够利用热处理模具121将一次吹塑成形品30的主体部32和肩部33加热为不同的温度。 Accordingly, the heat treatment mold 121 can be utilized to primary blow molded article main body portion 32 and a shoulder 33 30 different heating temperatures. 此外,热处理用芯模122能够从顶端供给气体以及排气。 Further, heat can be supplied and the exhaust gas from the core mold 122 to the top.

[0058] 该热处理吹塑成形模具120被预先加热为既定温度。 [0058] The heat-treating blow mold 120 is heated to a predetermined temperature in advance. 在热处理工序中,向一次吹塑成形品30的内部送入高压气体,令一次吹塑成形品30与热处理模具121内的内壁面126接触既定时间而进行加热处理(热定形处理)。 In the heat treatment step, the molded product 30 to the interior of the primary blow gas into the higher pressure, so that primary blow molding an inner wall surface 126 in contact with the product 30 within the heat treatment mold 121 for a predetermined time to heat treatment (heat setting). 之后将一次吹塑成形品30内的气体排气并且将一次吹塑成形品30从热处理模具121取出,从而形成中间成形品40。 After the primary blow molded article 30 in the exhaust gas and the primary blow-molded article was removed from the heat treatment mold 30 121, to form an intermediate molded article 40. S卩,在将一次吹塑成形品30内的气体排气并且从热处理模具121取出一次吹塑成形品30时,一次吹塑成形品30收缩而成为纵轴长度L3比作为最终成形品的大型容器10的纵轴长度L2短的中间成形品40。 S Jie, in the primary blow molded article 30 in the exhaust gas and the heat treatment mold 121 is removed from the primary blow-molded article 30, the primary blow molded article 30 longitudinal length L3 become the shrinkage ratio of the molded article as the final large the length L2 of the longitudinal axis of the container 10 of the intermediate molded article 40 is short.

[0059] 在此,在热处理工序中,一次吹塑成形品30的至少主体部32为比后述的最终成形工序中的加热温度高的温度,例如优选以140°C〜180°C被加热。 [0059] Here, in the heat treatment step, the primary blow molded article at least a portion 30 of the main body 32 to a high temperature heating step than the temperature described later final shaping, for example, preferably is heated to 140 ° C~180 ° C . 例如,在本实施方式中,基于多个加热器124的热处理模具121的加热温度被设定为例如140°C〜180°C。 For example, in the present embodiment, the heater 124 based on the plurality of heat treatment mold 121 is set to a heating temperature of, for example, 140 ° C~180 ° C. 此时的加热处理(热定形)时间优选设定为8s〜16s之间。 The heating process (heat setting) is preferably set to a time between 8s~16s. 由此,除去一次吹塑成形品30的残余应力而提高作为最终成形品的大型容器10的耐热性。 Thereby, residual stress is removed primary blow molded article 30 is improved as a large vessel the heat resistance of the final molded product 10.

[0060] 进而,在如上所述那样一次吹塑成形品30的肩部33形成得比主体部32壁厚时,在热处理工序中如果对肩部33以与主体部32相同的温度进行加热,则在冷却时有可能产生伴随着PET树脂的球结晶化的白化。 When [0060] Further, as described above primary blow molded article 30 of the shoulder portion 33 is formed larger than the wall thickness of the body portion 32, in the heat treatment step 33, if heated to the same temperature as the body portion 32 shoulder portion, it is possible to produce the PET resin ball accompanied whitening crystallization upon cooling. 因此,肩部33优选以低于主体部32的温度的温度,以例如80°C〜110°C的温度加热。 Thus, the shoulder 33 is preferably at a temperature lower than the temperature of the main body portion 32, for example, heated at a temperature of 80 ° C~110 ° C. 在本实施方式中,通过向热处理模具121的供给路125内供给温度调节介质而以80°C〜110°C的温度加热肩部33。 In the present embodiment, by supplying the temperature control medium into the heat treatment mold 121, the supply path 125 and the shoulder portion 33 is heated at a temperature of 80 ° C~110 ° C. 由此,能够抑制壁厚较厚的肩部33的PET树脂的球结晶化导致的白化。 Accordingly, the shoulder portion can be suppressed and the thick PET resin ball 33 due to whitening crystallization. 另外出于同样的理由,在热处理工序中,优选一次吹塑成形品30的底部34也利用温度调节介质而加热为比较低的温度。 Also for the same reason, in the heat treatment step, preferably primary blow molded article 30 has a bottom 34 with a temperature regulating medium is heated to a relatively low temperature.

[0061] 这样地形成的中间成形品40形成为比作为最终成形品的大型容器10小的尺寸,具有颈部41、筒状的主体部42、连接主体部42和颈部41的肩部44、堵住主体部42的一端的底部45。 Intermediate [0061] The thus formed molded article 40 is formed larger than a container as a final molded product of small size 10, a neck 41, a cylindrical body portion 42, shoulder portion connecting the body portion 42 and the neck 41 of 44 , which closes one end of the main body portion 42 of the bottom 45. 含有颈部41的纵轴长度L4也比大型容器10的纵轴长度L2短(参照图2)。 Longitudinal length L4 comprising the length of the longitudinal axis of the neck portion 41 is larger than L2 of the shorter container 10 (see FIG. 2).

[0062] 之后,将该中间成形品40如图6所示地配置在被加热为既定温度的最终吹塑成形模具130内。 After [0062], the intermediate molded article 40 disposed in FIG heated to a predetermined temperature of the final blow-molding mold 130 as shown in 6. 在该最终吹塑成形模具130内吹塑成形中间成形品40,从而得到作为最终成形品的大型容器10 (参照图2)。 In this final blow molding die 130 blow molding the intermediate molded article 40, so as to obtain a final large containers molded article 10 (see FIG. 2).

[0063] 最终吹塑成形模具130具有:收纳中间成形品40且在上下方向分为两个的最终吹塑可分模131、将中间成形品40的颈部41插入在内部的最终处理用芯模132、对应于中间成形品40的底部45的上底模133。 [0063] The final blow mold 130 has: housing and into the intermediate molded article 40 can be divided into two final blow mold 131, the intermediate molded article 40 of the neck portion 41 is inserted inside the core of the final processing in the vertical direction die 132, corresponding to the intermediate mold 133 formed on the bottom 40 of the bottom 45 of the article. 此外,在最终吹塑可分模131的成形空间的周围沿着纵轴方向设置有多个供给温度调节介质的供给路134。 Further, around the final blow split mold forming space 131 is provided along the longitudinal direction with a plurality of supply passage 134 supplying temperature regulating medium. 利用在这些的多个供给路134内循环的温度调节介质而将成形空间内的中间成形品40加热至既定温度。 Using circulating within these plurality of supply passages 134 and the temperature control medium within a molding space intermediate molded article 40 is heated to a predetermined temperature.

[0064] 在最终成形工序中,配置在最终吹塑成形模具130内的中间成形品40利用被供给至其内部的高压气体而沿纵轴方向以及横轴方向延伸,被推压于最终吹塑可分模131的内壁面135而被热处理,成形作为最终成形品的大型容器10 (参照图1)。 [0064] In the final shaping step, disposed in the final blow-molding the intermediate molded product 40 using the mold 130 is extended to the high pressure gas is supplied to the inside thereof along the longitudinal direction and the transverse axis, is pressed against the final blow a split mold and the inner wall surface of 135,131 is heat treated shaped molded article as a final large container 10 (see FIG. 1). 具体而言,最终吹塑成形模具130被预先加热至既定温度例如80°C〜110°C,在该温度下将中间成形品40以既定时间例如25s〜30s之间进行热定形,从而形成大型容器10。 Specifically, the final blow mold 130 is preheated to a predetermined temperature, for example 80 ° C~110 ° C, at which temperature the intermediate molded article 40 at a predetermined heat setting time between 25s~30s e.g., to form a large container 10.

[0065] 通过利用以上说明的方法制造由PET树脂构成的大型容器,能够实现耐热性优异且提高了透明性的大型容器。 [0065] The manufacture of large container made of a PET resin by using the above described method, it is possible to achieve excellent heat resistance and improved transparency of a large container. 在一次吹塑成形工序中通过加热一次吹塑成形品而促进PET树脂的结晶化,此外,利用热处理工序令一次成形品收缩而形成中间成形品时将残余应力除去,所以能够提高作为最终成形品的大型容器的耐热性。 In the primary blow-molding the primary blow-molded article by heating to promote crystallization of the PET resin and, in addition, make use of a heat treatment step to form a primary intermediate molded article molding shrinkage residual stress is removed when the product can be improved as a final molded article large heat-resistant containers.

[0066] 此外,通过令预塑形坯的纵轴长度比作为最终成形品的大型容器长,能够将一次吹塑成形工序中的预塑形坯的延伸倍率抑制为较小,能够抑制此时产生的PET树脂的延伸结晶白化。 [0066] Further, the longitudinal length of the preform so that the ratio of the final length of the vessel as a large molded article, the primary blow molding can be preform step is suppressed to a small stretching magnification can be suppressed at this time extending the PET resin produced whitening crystallization. 进而,通过令预塑形坯的纵轴长度比大型容器长,能够大幅地增加预塑形坯的重量而提高大型容器的刚性。 Further, by having the longitudinal length of the preform, the preform is possible to increase the weight of the container longer than large and significantly increase the rigidity of the large container. 特别地,在本实施方式中,不仅在中间成形工序,在最终成形工序中也对中间成形品40进行热定形,所以能够可靠地提高作为最终成形品的大型容器10的刚性。 In particular, in the present embodiment, not only in the middle of molding step, the final forming step is also performed on the heat-set intermediate molded article 40, it is possible to reliably improve the final container as a large molded article 10 is rigid.

[0067] 因而,能够实现耐热性优异且良好地维持了透明性的大型容器10。 [0067] Accordingly, it is possible to achieve excellent heat resistance and good transparency was maintained large container 10. 例如,与由一次吹塑成形而形成的以往的大型容器相比能够大幅提高耐热性且能够得到与以往的大型容器相同或者之上的透明性。 For example, compared with the conventional large container by the primary blow molding is formed can be greatly improved, and the heat resistance can be obtained with the same container or on a conventional large-scale transparency. 例如,大型容器10即便多次(20次左右)进行60°C〜70°C的碱性温水清洗也不会变形(收缩),此外能够可靠地防止裂纹的发生。 For example, even if large containers 10 times (about 20 times) alkaline warm water of 60 ° C~70 ° C do not deform (shrink), furthermore possible to reliably prevent generation of cracks. 因而能够适宜地用于例如矿泉水用可反复利用瓶等的需要进行温水清洗的用途。 It is possible to suitably use, for example, mineral water bottle may be used repeatedly in the use of warm water is required.

[0068] 以上说明了本发明的一实施方式,但当然本发明能够在不脱离其主旨的范围内进行各种变更。 [0068] The above described embodiment of the present invention an embodiment, but of course the present invention can be variously modified without departing from the scope thereof.

[0069] 例如,在上述的实施方式中,说明了形成一次吹塑成形品并且将该一次吹塑成形品形成为中间成形品的中间成形工序包含一次吹塑成形工序和热处理工序的例子,但中间成形工序不限定于此。 [0069] For example, in the above-described embodiment, the described primary blow molded article is formed and the primary blow molded article is formed as an intermediate product comprising the intermediate step of forming an example of primary blow-molding step of molding and heat treatment, but intermediate molding step is not limited thereto. 例如,中间成形工序也可以实质上同时进行这些一次吹塑成形工序和热处理工序。 For example, the intermediate molding step may be performed substantially simultaneously such primary blow-molding and heat treatment step. 例如,在上述的热处理吹塑成形模具120等的内部配置预塑形坯,在预先被加热至既定温度的该热处理吹塑成形模具内吹塑成形该预塑形坯而形成一次吹塑成形品。 For example, in the heat treatment mold 120 and the like inside the blow molding preform configuration, blow molding the preform into a mold to form a primary blow-molded article is heated in advance to a predetermined heat treatment temperature of the blow-molding . 而且,也可以将该一次吹塑成形品与热处理吹塑成形模具的内壁面接触从而进行加热处理(热定形)。 Further, the primary blow-molded article is also heat the blow mold and the inner wall surface contact to perform a heat treatment (heat setting). 此时,通过在之后将一次吹塑成形品内的气体排出并且从热处理吹塑成形模具内取出一次吹塑成形品,一次吹塑成形品收缩而成为中间成形品。 In this case, by discharging the gas after the primary blow molded article in the heat treatment and blow molding from the mold, taking out the blow molding, the primary blow molded article shrink an intermediate molded article.

Claims (5)

1.一种大型容器的制造方法,其特征在于,具有下述工序: 注射工序,将聚对苯二甲酸乙二醇脂树脂注射成形而形成纵轴长度比作为最终成形品的大型容器长的预塑形坯; 中间成形工序,对上述预塑形坯进行吹塑成形而形成比上述大型容器直径大而且纵轴长度长的一次吹塑成形品,对该一次吹塑成形品加热并且使该一次吹塑成形品收缩,形成比上述大型容器直径小而且纵轴长度短的中间成形品; 最终成形工序,将上述中间成形品在加热至既定温度的最终吹塑成形模具内吹塑成形而得到既定形状的上述大型容器。 1. A method for manufacturing a large container, comprising the steps of: injecting step, the polyethylene terephthalate resin for injection molding is formed larger than the length of the longitudinal axis of the container as a final molded product of preform; intermediate molding step is formed larger than the longitudinal axis of the container and the length of the large diameter of the primary blow molded article of the preform for blow molding, the primary blow-molded article is heated and that the shrinking the primary blow-molded article, formed shorter than the large and small diameter longitudinal length of the intermediate container formed product; final molding step, the intermediate molded article is heated to a predetermined temperature in the final blow-molding and blow-molding in a mold to give large container above a predetermined shape.
2.根据权利要求1所述的大型容器的制造方法,其特征在于, 上述中间成形品具有开口的颈部、筒状的主体部、密封该主体部的一端的底部、和连接上述颈部与上述主体部且比上述主体部壁厚的肩部, 在上述中间成形工序中,在加热上述一次吹塑成形品时,将上述一次吹塑成形品的肩部以比上述主体部低的温度加热。 The method for producing a large container according to claim 1, wherein said intermediate molded article having a neck opening, a cylindrical body portion, a bottom seal one end of the body portion, and a neck connecting the the main body portion and a shoulder portion of the main body portion than the wall thickness of the intermediate molding step, at the time of heating the primary blow molded article, the above primary blow-molded article of the shoulder than the main body portion at a low temperature heating .
3.根据权利要求2所述的大型容器的制造方法,其特征在于, 在上述中间成形工序中,在加热上述一次吹塑成形品时,上述主体部的温度为140°C〜180 °C,上述肩部的温度为80 °C〜110°C。 The method for producing a large container according to claim 2, characterized in that the intermediate molding step, at the time of the primary blow-molded article is heated, the temperature of the main body portion is 140 ° C~180 ° C, the temperature of the shoulder portion is 80 ° C~110 ° C.
4.根据权利要求1〜3的任意一项所述的大型容器的制造方法,其特征在于, 在上述中间成形工序中包含下述工序: 在保持为常温的一次吹塑成形模具内将上述预塑形坯吹塑成形而形成上述一次吹塑成形品的一次吹塑成形工序; 令上述一次吹塑成形品与加热为既定温度的热处理模具的内壁面接触而对一次吹塑成形品加热、并且将其内部的气体排出从而令其收缩而形成上述中间成形品的热处理工序。 4. A method of manufacturing a large container according to any one of claims 1 ~ 3, characterized in that the molding step comprising the step of the intermediate: will be within the pre-mold holding the primary blow molding to room temperature blow molding of preforms formed of the primary blow-molded article of the primary blow molding step; order of the primary blow-molded article was heated in contact with the inner wall surface of the heat treatment mold of the predetermined temperature of the heated primary blow molded article and the exhaust gas so that its internal allowed to shrinkage heat treatment step of forming the intermediate molded article.
5.根据权利要求1〜3的任意一项所述的大型容器的制造方法,其特征在于, 在上述中间成形工序中,在加热为既定温度的一次吹塑成形模具内将上述预塑形坯吹塑成形而形成上述一次吹塑成形品,并且该一次吹塑成形品通过与上述一次吹塑成形模具的内壁面接触而被加热,并且通过将其内部的气体排出而令其收缩而形成上述中间成形品O 5. The method of manufacturing a large container according to any one of claims 1 ~ 3 in claim 1, characterized in that in the intermediate step of forming, in a mold where the preform will be heated to a predetermined temperature of the primary blow molding blow-molding the primary blow-molded article is formed, and the primary blow molding to form the product by the above primary blow mold inner wall surface is heated in contact, and is allowed to shrink by discharging the gas inside thereof intermediate molded article O
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US8968635B2 (en) 2015-03-03 grant

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